University of California Press

Table 1.

DNA nitrogen base grid.

Nitrogen Base	Kind of Base	Bonds with	Number of Rings	Relative Size of Molecule	Number of H Bonds
A	Purine	T	2	Long	2
G	Purine	C	2	Long	3
C	Pyrimidine	G	1	Short	3
T	Pyrimidine	A	1	Short	2

Nitrogen Base	Kind of Base	Bonds with	Number of Rings	Relative Size of Molecule	Number of H Bonds
A	Purine	T	2	Long	2
G	Purine	C	2	Long	3
C	Pyrimidine	G	1	Short	3
T	Pyrimidine	A	1	Short	2